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Thread: autofill backflow prevention, below grade

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    Join Date
    Dec 2013
    Location
    SF, CA, USA
    Posts
    40

    autofill backflow prevention, below grade

    hi folks, i have a fill valve (not an anti-siphon one) in my design connecting the domestic hot water supply, which isheated on demand, to the hot tub loop. the equipment is mounted lower than the tub will be installed. i put a brass swing check valve at the hot water supply, and of course the municipal water supply is at higher pressure than the head creates, but i don't know if this enough prevention for a prudent setup. i don't need one of those complicated RPBP units, i hope. if anyone with experience can comment i'd appreciate it. my several pool books don't address this question, maybe because most installs don't have filler valves. thanks!
    plumbing up wall-mounted equipment and plenty gauges below a 500G wooden outdoor hot tub.

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: autofill backflow prevention, below grade

    One of the more complex certified back flow preventer valves is recommended. Some areas require them, others don't, but they are always a good idea. "Need" depends on your local regulations and if not required, personal preferences.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    Dec 2013
    Location
    SF, CA, USA
    Posts
    40

    Re: autofill backflow prevention, below grade

    thank you JasonLion. i need more detail so i will keep looking into which types of preventer seem adequate. my goal is to do something both moral and economical.
    plumbing up wall-mounted equipment and plenty gauges below a 500G wooden outdoor hot tub.

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